A statistical measure of the relationship between two variables, indicating the degree to which they change together without implying causation.
From Latin 'correlatio' meaning 'a mutual relation,' from 'cor-' (together) + 'relatio' (a bringing back).
Correlation means two things move together — but remember, correlation does NOT mean causation! Ice cream sales and drownings both rise in summer, but one doesn't cause the other.
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